Suggestions to reduce rust on water pump bolts?

Installing a new water pump today on my 71 Duster & would like to do something to reduce corrosion on bolts. When I removed the old waterpump - one bolt was rusted stuck. I think the corrosion was on the bolt above the threads where it passed thru the water pump. Is wheel bearing grease as good as anything on the bolts when I re-install?

So, one bolt was rusted stuck. I'm sort of assuming that this was a thread problem, but then you mentioned the bolt was rusted above the threads where it passed through the water pump...? Well, anyway.....I would paint the unthreaded length of those long bolts (new ones) with Rustoleum brown and do that liquid teflon sealer on the threads.